CTH A will be closed between 6:30 a.m. and 4:00 p.m. to replace a culvert between CTH PB and Observatory Road. The work require the road to be closed to all traffic on Tuesday, May 30th while the culvert is out and open should be open again at the end of the day. Finishing work will occur on Wednesday, May 31st so there may be temporary closures as the asphalt patch is constructed but emergency vehicles will be able to get through.